Lab 7 Charles Law V = V T T PreLab due by : 4/25 Performance date: 4/25 In Room 220.

Lab 7Charles’ Law

V = V’T T’

PreLab due by : 4/25Performance date: 4/25

In Room 220.

Pre Lab:• Page 1– I Intro– II Materials/Equipment– III Diagram

• Page 2– IV Safety (see next frame)– V Procedure

• Next Page – VI Data Table (copy table 26-1 and add 2 columns

for Trials 2 and 3)

Safety

You must wear: • close toed shoes (no flip flops or sandals)• Apron, goggles and have long hair tied back• Watch for hot surfaces – if you get a burn, run

cold water over the burnKeep thermometers from rolling off counter

Write up is to include:

• Your prelab with your name on top right• Lab # and name on top left• Data• Calculations• Conclusions (discussion is titled conclusion)• Graph

DATA

See next slide

CalculationsLet’s do one complete set of calculations to find T’ and

V’. You will end up with 3 points to plot.T went from 96.0 oC to 25.5oC#5 volume of gas collected: 206.5 cm3

#8 pressure of dry gas101.3 kPa x 760 mm = 759.8 mm

101.325PaCorrect for WVP: 25 = 23.8 x = 24.3 mm

25.5 x759.8 mm - 100.0 mm – 24.3 mm = 728 mm

13.5

Calc., cont.

#9: Use Boyle’s Law to find V’V’ = PV = (#8)(#5) = 728 mm (206.5 cm3) P’ (#6) 759.8 mmV’ = 197.9 = 198 cm3

1stpoint to plot: T’,V’ = 298.5K, 198 cm3